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- From: john.holmgren@spacebbs.com (John Holmgren)
- Newsgroups: sci.energy
- Subject: Why not 120 VDC ? Why in
- Message-ID: <5840.1017.uupcb@spacebbs.com>
- Date: 26 Jan 93 07:47:00 GMT
- Distribution: world
- Organization: SPACE BBS - Menlo Park, CA - 10 Lines + 4gB - 415-323-4193
- Reply-To: john.holmgren@spacebbs.com (John Holmgren)
- Lines: 24
-
- EM>Pondering this ... Why not just use a 120 VDC battery pack and use
- EM>120 VDC for a bunch of stuff? Lightbulbs don't care if they are
- EM>AC or DC, nor do electric stoves and ovens or other resistive heat
- EM>sources. Some tools have AC/DC motors. 120 VDC was a common motor
- EM>type not too long ago, so I'd expect some motors to be available
- EM>for things like house fans.
-
- Not a bad idea, but I think that there are several objections:
-
- 1- will still need some AC as well as DC since some tools require AC, and
- it DOES make a difference to bulbs, in terms of life.
-
- 2-DC switches have arcing and sticking and contact burning problems.
-
- 3-Inverters are about 80-90 % efficient now. Also, by adding 12 VDC
- circuits you can eliminate transformers in most transistor stuff.
-
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